I like lolis and all, but I prefer a little bit older in general. It's more like a niche/fetish that sometimes I feel like liking and sometimes I don't.
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Also sexual dimorphism isn't always black and white.
Females (specifically 18-24) don't like dimorphic traits in males like-
Jew noses
Too much low trust eyebrows
Narrow mouth
Small face relative to skull
Bald or short hair
Short eyelashes
Males don't like dimorphic traits in females like-
Huge tits
rounded jaw
Short height
thin skin
I definitely think not having absolute sexual dimorphism in the world is due to the idea of youth. Your ideals change as you get older, especially in females. It has to do with Neotenic features as well.